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A convenient way to set up an efficient partial or full backup of a gokrazy device’s permanent data partition is to use the gokrazy rsync daemon. This article walks you through how I have set up my backup, but many variants are possible to cater to different requirements.">
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A convenient way to set up an efficient partial or full backup of a gokrazy device’s permanent data partition is to use the gokrazy rsync daemon. This article walks you through how I have set up my backup, but many variants are possible to cater to different requirements.">
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<h1 id="permanent-data-backup-with-the-gokrazy-rsync">Permanent data backup with the gokrazy rsync</h1>

<p>I like to periodically back up all scans from my <a href="/packages/showcase/index.html">scan2drive
appliance</a> to my PC. The PC is backed up as well, so that
automatically distributes my scans to multiple machines in case one of them
fails.</p>
<p>A convenient way to set up an efficient partial or full backup of a gokrazy
device’s permanent data partition is to use <a href="https://github.com/gokrazy/rsync" rel="external">the gokrazy rsync
daemon</a>. This article walks you through how I
have set up my backup, but many variants are possible to cater to different
requirements.</p>
<p>(You don’t typically need backups of your gokrazy device’s root partition
because it can be built reproducibly any time using Go.)</p>
<h2 id="install">Step 1. Install the gokrazy rsync daemon<span class="btn cstyle anchor copyanchor scrollanchor link noborder notitle interactive"><button type="button" title="Copy link to clipboard"><i class="fa-fw fas fa-link fa-lg"></i></button></span></h2>
<p>Add the gokrazy rsync implementation <code>gokr-rsync</code> to your gokrazy instance:</p>
<div class="highlight actionbar-wrapper wrap-code" dir="auto"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span>gok add github.com/gokrazy/rsync/cmd/gokr-rsync</span></span></code></pre></div>
<h2 id="configure">Step 2. Configure the gokrazy rsync daemon<span class="btn cstyle anchor copyanchor scrollanchor link noborder notitle interactive"><button type="button" title="Copy link to clipboard"><i class="fa-fw fas fa-link fa-lg"></i></button></span></h2>
<p>Open your gokrazy instance’s <code>config.json</code> in your editor:</p>
<div class="highlight actionbar-wrapper wrap-code" dir="auto"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span>gok edit</span></span></code></pre></div>
<p>Configure <a href="/userguide/package-config/index.html#flags">Package config: Command-line flags</a> and <a href="/userguide/package-config/index.html#extrafiles">Package config: Extra files</a>:</p>
<div class="highlight actionbar-wrapper wrap-code" dir="auto"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;display:grid;"><code class="language-json" data-lang="json"><span style="display:flex;"><span>{
</span></span><span style="display:flex;"><span>    <span style="color:#f92672">&#34;Hostname&#34;</span>: <span style="color:#e6db74">&#34;backedup&#34;</span>,
</span></span><span style="display:flex;"><span>    <span style="color:#f92672">&#34;Packages&#34;</span>: [
</span></span><span style="display:flex;"><span>        <span style="color:#e6db74">&#34;github.com/gokrazy/fbstatus&#34;</span>,
</span></span><span style="display:flex;"><span>        <span style="color:#e6db74">&#34;github.com/gokrazy/hello&#34;</span>,
</span></span><span style="display:flex;"><span>        <span style="color:#e6db74">&#34;github.com/gokrazy/serial-busybox&#34;</span>,
</span></span><span style="display:flex;"><span>        <span style="color:#e6db74">&#34;github.com/gokrazy/breakglass&#34;</span>,
</span></span><span style="display:flex;"><span>        <span style="color:#e6db74">&#34;github.com/gokrazy/rsync/cmd/gokr-rsync&#34;</span>
</span></span><span style="display:flex;"><span>    ],
</span></span><span style="display:flex;"><span>    <span style="color:#f92672">&#34;PackageConfig&#34;</span>: {
</span></span><span style="display:flex; background-color:#3c3d38"><span>        <span style="color:#f92672">&#34;github.com/gokrazy/rsync/cmd/gokr-rsync&#34;</span>: {
</span></span><span style="display:flex; background-color:#3c3d38"><span>            <span style="color:#f92672">&#34;Basename&#34;</span>: <span style="color:#e6db74">&#34;rsync&#34;</span>,
</span></span><span style="display:flex; background-color:#3c3d38"><span>            <span style="color:#f92672">&#34;CommandLineFlags&#34;</span>: [
</span></span><span style="display:flex; background-color:#3c3d38"><span>                <span style="color:#e6db74">&#34;--daemon&#34;</span>,
</span></span><span style="display:flex; background-color:#3c3d38"><span>                <span style="color:#e6db74">&#34;--gokr.config=/etc/gokr-rsyncd.toml&#34;</span>
</span></span><span style="display:flex; background-color:#3c3d38"><span>            ],
</span></span><span style="display:flex; background-color:#3c3d38"><span>            <span style="color:#f92672">&#34;ExtraFilePaths&#34;</span>: {
</span></span><span style="display:flex; background-color:#3c3d38"><span>                <span style="color:#f92672">&#34;/etc/gokr-rsyncd.toml&#34;</span>: <span style="color:#e6db74">&#34;gokr-rsyncd.toml&#34;</span>,
</span></span><span style="display:flex; background-color:#3c3d38"><span>                <span style="color:#f92672">&#34;/etc/gokr-rsyncd.authorized_keys&#34;</span>: <span style="color:#e6db74">&#34;gokr-rsyncd.authorized_keys&#34;</span>
</span></span><span style="display:flex; background-color:#3c3d38"><span>            }
</span></span><span style="display:flex; background-color:#3c3d38"><span>        }
</span></span><span style="display:flex;"><span>    }
</span></span><span style="display:flex;"><span>}</span></span></code></pre></div>

<p>In the daemon config file, configure an authorized SSH listener and which
rsync modules to serve:</p>
<div class="highlight actionbar-wrapper wrap-code" dir="auto"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span>cat &gt; ~/gokrazy/hello/gokr-rsyncd.toml <span style="color:#e6db74">&lt;&lt;&#39;EOT&#39;
</span></span></span><span style="display:flex;"><span><span style="color:#e6db74">dont_namespace = true 
</span></span></span><span style="display:flex;"><span><span style="color:#e6db74">[[listener]]
</span></span></span><span style="display:flex;"><span><span style="color:#e6db74">  [listener.authorized_ssh]
</span></span></span><span style="display:flex;"><span><span style="color:#e6db74">    address = &#34;scan2drive.lan:22873&#34;
</span></span></span><span style="display:flex;"><span><span style="color:#e6db74">    authorized_keys = &#34;/etc/gokr-rsyncd.authorized_keys&#34;
</span></span></span><span style="display:flex;"><span><span style="color:#e6db74">[[module]]
</span></span></span><span style="display:flex;"><span><span style="color:#e6db74">  name = &#34;scans&#34;
</span></span></span><span style="display:flex;"><span><span style="color:#e6db74">  path = &#34;/perm/scans&#34;
</span></span></span><span style="display:flex;"><span><span style="color:#e6db74">EOT</span></span></span></code></pre></div>
<p>Finally, create the authorized keys file that determines who can access the rsync daemon:</p>
<div class="highlight actionbar-wrapper wrap-code" dir="auto"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span>cat &gt; ~/gokrazy/hello/gokr-rsyncd.authorized_keys <span style="color:#e6db74">&lt;&lt;&#39;EOT&#39;
</span></span></span><span style="display:flex;"><span><span style="color:#e6db74">ssh-ed25519 […] michael@midna
</span></span></span><span style="display:flex;"><span><span style="color:#e6db74">EOT</span></span></span></code></pre></div>
<p>Then, deploy as usual:</p>
<div class="highlight actionbar-wrapper wrap-code" dir="auto"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span>gok update</span></span></code></pre></div>
<h2 id="ssh">Step 3. Configure SSH from the backup machine<span class="btn cstyle anchor copyanchor scrollanchor link noborder notitle interactive"><button type="button" title="Copy link to clipboard"><i class="fa-fw fas fa-link fa-lg"></i></button></span></h2>
<p>On your PC (not the gokrazy instance), add an SSH configuration stanza to your
<code>~/.ssh/config</code> to configure the custom port (22873 for ssh+rsync) and which
passwordless identity file to use (for the <a href="/userguide/rsync-backups/index.html#cron">cron job in step 4</a>):</p>
<div class="highlight actionbar-wrapper wrap-code" dir="auto"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-text" data-lang="text"><span style="display:flex;"><span>Host scan2drive-backup
</span></span><span style="display:flex;"><span>    Hostname scan2drive.lan
</span></span><span style="display:flex;"><span>    Port 22873
</span></span><span style="display:flex;"><span>    IdentityFile ~/.ssh/id_ed25519_scan2drivebackup</span></span></code></pre></div>
<p>Now you should be able to run rsync via SSH as usual:</p>
<div class="highlight actionbar-wrapper wrap-code" dir="auto"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span>rsync -av -e ssh rsync://scan2drive-backup/scans/ ~/scan2drive-backup/</span></span></code></pre></div>
<h2 id="cron">Step 4. Configure a daily cron job<span class="btn cstyle anchor copyanchor scrollanchor link noborder notitle interactive"><button type="button" title="Copy link to clipboard"><i class="fa-fw fas fa-link fa-lg"></i></button></span></h2>
<p>First, install <a href="https://github.com/stapelberg/rsyncprom" rel="external">the <code>rsync-prom</code> tool</a>
to monitor your periodic transfer with <a href="https://prometheus.io/" rel="external">Prometheus</a>:</p>
<div class="highlight actionbar-wrapper wrap-code" dir="auto"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span>go install github.com/stapelberg/rsyncprom/cmd/rsync-prom@latest</span></span></code></pre></div>
<p>Then wrap the above rsync command in an rsync-prom invocation in a shell script called <code>scan2drive-backup-sync.sh</code>:</p>
<div class="highlight actionbar-wrapper wrap-code" dir="auto"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span><span style="color:#75715e">#!/bin/sh
</span></span></span><span style="display:flex;"><span><span style="color:#75715e"></span>SSH_AUTH_SOCK<span style="color:#f92672">=</span> ~/go/bin/rsync-prom --instance<span style="color:#f92672">=</span><span style="color:#e6db74">&#34;scan2drive@midna&#34;</span> <span style="color:#ae81ff">\
</span></span></span><span style="display:flex;"><span><span style="color:#ae81ff"></span>  rsync -av -e ssh rsync://scan2drive-backup/scans/ ~/scan2drive-backup/</span></span></code></pre></div>
<p>Finally, run <code>crontab -e</code> and run the script at your convenience, like so:</p>
<div class="highlight actionbar-wrapper wrap-code" dir="auto"><pre tabindex="0"><code>30 07 * * * /home/michael/scan2drive-backup-sync.sh</code></pre></div>

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